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JLE TPA3255 Build and Modifications
JLE TPA3255 Build and Modifications
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Old 19th July 2021, 11:04 AM   #331
maciekw is online now maciekw  Poland
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Join Date: Nov 2004
Location: Warsaw
Quote:
Originally Posted by JLesterP View Post
It is required for PFFB stability specially on open load condition, it will also remove some grit in high volume listening. (also applicable with other TPA3255 builds)
Hi Lester,
Looking at the PFFB schematic shown in Application Report SLAA788A, we see that the buffer operational amplifiers are not affected by global amplifier feedback. Thus, limiting the bandwidth by adding a capacitor in the OPamp feedback should have no effect on the stability of the amplifier's no-load operation. Of course they improve the stability of the buffer, but on the other hand taking into account the filters used in signal sources (e.g. in DACs) it seems that capacitors are not necessary. Please point out the error in my thinking.
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Old 19th July 2021, 11:47 AM   #332
JLesterP is offline JLesterP  Philippines
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Join Date: Sep 2010
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JLE TPA3255 Build and Modifications
Quote:
Originally Posted by maciekw View Post
Hi Lester,
Looking at the PFFB schematic shown in Application Report SLAA788A, we see that the buffer operational amplifiers are not affected by global amplifier feedback. Thus, limiting the bandwidth by adding a capacitor in the OPamp feedback should have no effect on the stability of the amplifier's no-load operation. Of course they improve the stability of the buffer, but on the other hand taking into account the filters used in signal sources (e.g. in DACs) it seems that capacitors are not necessary. Please point out the error in my thinking.
Purpose is to limit the gain at high frequencies. It will prevent high frequency instability at open load conditions since some users might input high frequency into the amp not knowing that the amp cannot handle it. If you are sure that there are no other high frequencies being injected into the system, then the amp will be fine.
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